Interesting study I just read re democratic republic of Congo. Lower incidence of covid in Southern Asia and Africa may be explained by a prepandemic covid like illness producing covid like antibodies and T cells. Will post when I’m back on a computer. India would have to be explained but it may also be the answer for why the meltdown is happening there despite a 50% seroprevalence in some areas....the new mutations may not be as robustly covered by the prior prepandemic immunity.